The process by which dna makes a copy of itself is called: a transcription b replication c synthesis d translation

What's the waste product of electrons and pyruvate combining in fermentation?  

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis

Which of the following molecules can be broken down into simple sugars? a. nucleic acid b. protein c. lipid d. carbohydrate